Electronic Instability in a Zero-Gap Semiconductor: The Charge-Density Wave in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi>TaSe</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="bold">I</mml:mi></mml:math>

Tournier-Colletta, C.; Moreschini, Luca; Autès, G.; Moser, Simon; Crepaldi, Alberto; Berger, H.; Walter, Andrew L.; Kim, K. S.; Bostwick, Aaron; Monçeau, P.; Rotenberg, Eli; Yazyev, Oleg V.; Grioni, M.

doi:10.1103/physrevlett.110.236401

Cited by 48 publications

(60 citation statements)

References 36 publications

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“…As shown previously via DFT calculations and ARPES measurements, the CDW gap opens symmetrically around the crossing points of the initial electronic band structure. 42 Therefore, the Fermi level position is in the center of the initial Weyl cones.…”

Section: Estimate Of the Fermi Level Position From The Hall Measuremementioning

confidence: 99%

“…For our study, we use the quasi-one dimensional material (TaSe4)2I (Extended Data Fig. 1 (a)), which has recently been shown to be a Weyl semimetal 41 in its non-distorted structure ( Fig.1 (b 42 which is accompanied by the opening of an approximately 260 meV gap to single particle excitations. In a recent study, the momentum (k)space positions of the electronic susceptibility peaks calculated from the Fermi pockets of the Weyl points and the experimentally observed k = (222) satellite reflections in XRD measurements of the CDW phase of (TaSe4)2I have been found to match, indicating that the CDW nests the Weyl nodes and therefore breaks the chiral symmetry.…”

mentioning

confidence: 99%

“…Averaging over the saturated range, we obtain a value of av = 0.72 ± 0.04 and thus E =(259 ± 14) meV, which is in excellent agreement with literature. 42,43 Next, we investigate the motion of the CDW at zero magnetic field in the pinning potential created by impurities. Fig.…”

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confidence: 99%

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Axionic charge-density wave in the Weyl semimetal (TaSe4)2I

Gooth¹,

Bradlyn²,

Honnali³

et al. 2019

Nature

215

157

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An axion insulator is a correlated topological phase, predicted to arise from the formation of a charge density wave in a Weyl semimetal. The accompanying sliding mode in the charge density wave phase, the phason, is an axion. It is expected to cause anomalous magneto-electric transport effects. However, this axionic charge density wave has so far eluded experimental detection. In this paper, we report the observation of a large, positive contribution to the magneto-conductance in the sliding mode of the charge density wave Weyl semimetal (TaSe4)2I for collinear electric and magnetic fields (E||B).The positive contribution to the magneto-conductance originates from the anomalous axionic contribution of the chiral anomaly to the phason current, and is locked to the parallel alignment of E and B. By rotating B, we show that the angular dependence of the magneto-conductance is consistent with the anomalous transport of an axionic charge density wave. 3 Axions refer to elementary particles that have long been known in quantum field theory, 1,2 but have yet to be observed in nature. However, it has been recently understood that axions can emerge as collective electronic excitations in certain crystals, so-called axion insulators. 3 Despite being fully gapped to single-particle excitations in the bulk and at the surface, an axion insulator is characterized by an effective action, which includes a topological EB-term, where E and B are the electromagnetic fields inside the insulator, and  plays the role of the dynamical axion field. Physically, the average value of  is determined by the microscopic details of the band structure of the system, and gives rise to unusual magnetoelectric response properties such as quantum anomalous Hall conductivities 4-9 , the quantized circular photo-galvanic 4,10,11 effect, and the chiral magnetic effect. 4,[12][13][14] The prospect of realizing an axion insulator has inspired much theoretical and experimental work. Only very recently, signatures of a dynamic axion field have been found on the surface of magnetically doped topological insulator thin films. [15][16][17] However, the axionic quasi-particle in these systems-the axionic polariton 3 -has so far eluded experimental detection. Alternatively, axion insulators have been predicted to arise in Weyl semimetals that are unstable towards the formation of a charge density wave (CDW). [18][19][20][21][22][23] In their parent state, Weyl semimetals are materials in which the low-energy electronic quasiparticles behave as chiral relativistic fermions without rest mass, known as Weyl fermions. [24][25][26][27] The Weyl fermions exist at isolated crossing points of conductance and valence bands-so called Weyl nodes-and their energy can be approximated with a linear dispersion relation ( Fig. 1 (a)). The Weyl nodes always occur in pairs of opposite "handedness" or chirality. At low energies and in the absence of interactions the chirality is a conserved quantum number, and the two chiral populations do not mix. Parallel electric and mag...

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Section: Estimate Of the Fermi Level Position From The Hall Measuremementioning

confidence: 99%

mentioning

confidence: 99%

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Axionic charge-density wave in the Weyl semimetal (TaSe4)2I

Gooth¹,

Bradlyn²,

Honnali³

et al. 2019

Nature

215

157

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“…The linear chain compound (TaSe 4 ) 2 I has drawn considerable attention due to its intriguing electronic properties correlated to the quasi-1D structure. [1][2][3][4][5][6][7][8][9][10] TaSe 4 chains, parallelly aligned in the caxis and separated by strands of iodine atoms, serve as the building blocks of this paradigmatic quasi-1D material (Figure 1a). [11][12][13][14] Under ambient conditions, (TaSe 4 ) 2 I has a body-centered tetragonal unit cell (space group I422, no.…”

Section: Doi: 101002/adma202002352mentioning

confidence: 99%

Long‐Range Ordered Amorphous Atomic Chains as Building Blocks of a Superconducting Quasi‐One‐Dimensional Crystal

Zhou

Chen

et al. 2020

Advanced Materials

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Crystalline and amorphous structures are two of the most common solid‐state phases. Crystals having orientational and periodic translation symmetries are usually both short‐range and long‐range ordered, while amorphous materials have no long‐range order. Short‐range ordered but long‐range disordered materials are generally categorized into amorphous phases. In contrast to the extensively studied crystalline and amorphous phases, the combination of short‐range disordered and long‐range ordered structures at the atomic level is extremely rare and so far has only been reported for solvated fullerenes under compression. Here, a report on the creation and investigation of a superconducting quasi‐1D material with long‐range ordered amorphous building blocks is presented. Using a diamond anvil cell, monocrystalline (TaSe4)2I is compressed and a system is created where the TaSe4 atomic chains are in amorphous state without breaking the orientational and periodic translation symmetries of the chain lattice. Strikingly, along with the amorphization of the atomic chains, the insulating (TaSe4)2I becomes a superconductor. The data provide critical insight into a new phase of solid‐state materials. The findings demonstrate a first ever case where superconductivity is hosted by a lattice with periodic but amorphous constituent atomic chains.

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“…Особенности, присущие этим возбуждениям, в спектрах ARPES размываются из-за гауссовых флуктуаций и флуктуаций волнового вектора ВЗП на поверхности кристалла. В то же время в (TaSe 4 ) 2 I остаются существенными ЭФВ и ВЗП-щель, по всей видимости, открывается на фоне поляронной щели, существующей при температурах выше T P [24].…”

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ПОЛЯРОННАЯ МОДЕЛЬ ПСЕВДОЩЕЛЕВОГО СОСТОЯНИЯ В КВАЗИОДНОМЕРНЫХ СИСТЕМАХ, "Журнал Экспериментальной И Теоретической Физики"

Orlov

Dudnikov

2017

Журнал экспериментальной и теоретической физики

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Дается краткий обзор основных представлений и проблем физики квазиодномерных соединений. Главной проблемой остается последовательное теоретическое описание природы так называемого псевдощелевого состояния. В рамках кластерной теории возмущений рассматривается упрощенная модель псевдощелевого состояния, основанная на картине формирования поляронов малого радиуса.

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Electronic Instability in a Zero-Gap Semiconductor: The Charge-Density Wave in(TaSe4)2I

Cited by 48 publications

References 36 publications

Axionic charge-density wave in the Weyl semimetal (TaSe4)2I

Axionic charge-density wave in the Weyl semimetal (TaSe4)2I

Long‐Range Ordered Amorphous Atomic Chains as Building Blocks of a Superconducting Quasi‐One‐Dimensional Crystal

ПОЛЯРОННАЯ МОДЕЛЬ ПСЕВДОЩЕЛЕВОГО СОСТОЯНИЯ В КВАЗИОДНОМЕРНЫХ СИСТЕМАХ, "Журнал Экспериментальной И Теоретической Физики"

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